I've not shot any of the Federal Flight Control ammo...In theory it sounds good...there are rumors floating around that the point of impact is not consistent because of the steering effect of the wad.

I've tried some of the un-slit wads by Ballistic Products in a 13 ga. muzzleloader I had...the pattern could be turned into a slug at 25 yards with a point of impact problem. I slit the wad all kinds of different ways and the best I could ever improve the pattern with the wad was by a few pellets at 25 yards. Black Powder and plastic wads don't mix well.